Steam turbine



' v 'BY /F g v I ATTO NEY' 1,613,008 1927' 1.. M. ALMASY ET AL STEAM TURBINE Filed 061i. 12 1922 IN VEN TORS W i tit Patented Jan. 4, 1927.

UNITED STATES LAWRENCE M. ALMASY AND ALBERT SMITH, OF PITTSBURGH, PENNSYLVANIA.

STEAM TURBINE;

Application filed October 12. 1922. -Seria1 No. 594,018.

Our invention relates to new and useful improvements in single stage rotary steam turbines. more particularly to steam turbine blades therefor, and the primary object of the invention is to provide a blade of the type stated, in a manner as hereinafter set fortlr which is formed with recessed portions adapted for the engagement and retardation of the steam from the admission nozzles on its passage around said blades thereby augmenting the impetus imparted by the driving medium and increasing the clliciency of the turbine.

Further objects of the invention are to provide a turbine blade of the novel construction. described, which is simple in its construction and arrangement, which may be embodied in either the moving or stationary blades of the turbines, strong, durable and efficient in its use, and inexpensive to manufacture. l

v ith the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the detail of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention disclosed can be made within the scope of the claims hereunto appended without departingfrom the principle of the invention.

in the drawing forming a portion of this specification and wherein like numerals of reference designate corresponding parts throughout the several views Figure 1 is a perspective view of'a trubine blade in accordance with our invention.

Figure 2 is a side view thereof.

Figure 3 is a sectional view on line III III. Figure 2.

Figure 4 is a side View of a modified form of the device.

Figure 5 is Figure 4.

Referring in detail to the drawing 1 denotes the body portion of the turbine blade formed integrally with a shank 2 by which the blade is secured in position in the revol ving barrel of the turbine.

The general contour of the body portion 1. is similar to turbine blades now commonly used and are radially disposed in circumferential alignment in proximity to each other on the revolving barrel of the turbine. The body portion 1 together with the a sectional view on line VV,

shank 2 is formed with a radially aligned concaved forward face 3 and a corresponding convexed rear face at to permit of interengagement of adjacent blades upon the barrel of the turbine.

The convexed rear face 4 of the body portion 1 is recessed to provide a convex wall 5, which in conjunction with the concaved forward face of the adjacent blade assembled thereagainst, forms a passage-way for the driving medium, namely steam. etc.'

The outer end 6 of the body portion serves to confine the driving medium to the passageway. The driving medium is directed from the steam admission nozzles to enter the p:-issage-way at one side of the blades and impact against the concave faces 3 of the blades to impel the turbine barrel, after which it is exhausted through the passageway at the other side of said blades. t

The side of the blade wall at which the driving medium or steam enters is formed with a pocket 7. The length, depth, contour or angular disposition of the pocket 7 may be such as to best meet conditions found in practice, but relatively to its depth is preferably formed to extend parallel to the concave face 8 of the body portion 1.

In the use of our improved blade, the driving; medium will not only impact against the concave face 3.v of the biade in the usual manner but will also impact in the pocket 7 thereof. As the pocket 7 provides additional impacting: area for the driving medium, the power of the latter is proportionally increased resulting; in a more efficient turbine.

The modification of the turbine blade illustrated in Figures 4 and 5. of the drawing is identical in construction and operation as that described relative to the preferred form, with the exception that two pockets 7 are formed in the wall 5 instead of one such pocket. It will be obvious that a plurality of pockets may be successfully employed in the construction of our improved turbine blade.

\Vhile our improved turbine blade is primarily intended for use in single stage steam turbines, it will be obvious that the same may be employed in connection with any type of turbine wherein it is found to be applicable.

What we claim is 1. A turbine blade comprising a body portion provided with a shank and having a recessed rear wall, one of the side walls of said body portion being formed with a pocket.

2. A turbine blade comprising a body portion provided with a shank and a side wall formed With a pocket.

3. In aturbine. blade comprising a body portion provided with a shank and having a recessed rear Wall, a pocket formed in one side of said body portion and disposed forwardiy oi the recessed rear Wall.

recessed portion of said rear Wall and at one If? side thereof.

In testn'nony whereof We aflix our signatures.

LAWRENCE M. ALMASY. ALBERT J. SMITH. 

